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Michael_B
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| Data transfer and protocols |
 Posted: Tue Jan 24, 2006 6:40 am |
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Good day.
Can someone please explain me what to if i want to make this situation to work.
Hardware parts:
Transmiter
Reciever
Radio data transfer
Short range
Programming:
I send text data from transm. to reciever
Which data transfer protocol should i use and how to bundle this with CCS C ?
I know that this is bit "major" question and if you need additional info , please let me know... |
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jay miller
Guest
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| transfer protocall |
| Posted: Tue Jan 24, 2006 6:45 am |
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None, until you get reliable communications working! Both hardware and software should be tested without any, just simple 8 bit transfers.
Then you can decide , based on level of security, whether you need CRC,XMODEM or 'roll your own'. The later is best as only you should be able to make sense of the data stream.
I did that 30 years ago and noone has ever been able to 'break the lock'. |
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specialk
Joined: 12 Nov 2005
Posts: 27
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Guest
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| Posted: Tue Jan 24, 2006 9:00 am |
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Laipac RF-24G
hmmm, nice :-) but ...
I want to get data transmition range between 0 - 5 KM and i dont want to use such high frequency. In our country 5W output is the maximal FREE output which someone can use and this should be free service ( for such range ).
Is there possibility to get tranceiver with cca 500-700 MHZ which can be used with maximal output (5W) to get the 5 KM range ? There are some free frequencys in this range.
Any suggestions ?
Please note, i want to use the lowest frequency as possible ( for such range ). |
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newguy
Joined: 24 Jun 2004
Posts: 1909
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specialk
Joined: 12 Nov 2005
Posts: 27
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| Posted: Tue Jan 24, 2006 11:23 am |
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| Anonymous wrote: | | I want to get data transmition range between 0 - 5 KM and i dont want to use such high frequency. In our country 5W output is the maximal FREE output which someone can use and this should be free service ( for such range ). |
Here in the US, most of the radio bands are restricted in one way or another as well as the power of the radio signal being broadcasted. I wouldn't be able to make any suggestions for such a distance; however, amateur radio enthusiasts may have an idea as to what your options for a PIC-based wireless solution would be.
-special [k] |
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Guest
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| Posted: Tue Jan 24, 2006 12:02 pm |
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| Quote: | | however, amateur radio enthusiasts may have an idea as to what your options for a PIC-based wireless solution would be. |
Can you point me where to ask or should i wait if someone, at ccs forum, see this post ? |
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specialk
Joined: 12 Nov 2005
Posts: 27
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Guest
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| Posted: Tue Jan 24, 2006 1:15 pm |
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HEY MEN, YOUR THE BEST :-).
Im gonna take a look i i get back to you tomorrow ! |
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